Finding the Fourth Proportional to 127.61, 191.42 and 55.42

Step by Step Solution

1. Step 1: Write the proportion equation
   127.61 : 191.42 = 55.42 : x
2. Step 2: Convert to fraction form
   127.61/191.42 = 55.42/x
3. Step 3: Cross multiply
   127.61x = 191.42 × 55.42
4. Step 4: Simplify right side
   127.61x = 10,608.50
5. Step 5: Solve for x
   x = 10,608.50/127.61
6. Step 6: Final answer
   x = 83.13